USPTO 2015–2025 USPTO PatentsView US Corporation

National Chain Company

USPTO PatentsView assignee record - 38 granted patents across 12 technology areas, active 2015–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: A44C (PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS).

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

Explore the portfolio See the ranking

Total patents granted

CPC technology areas

8.1

Avg claims per patent

-27%

5-year filing velocity

The verdict

National holds 38 US patents across 12 technology areas, rank #8,451 of 50,000 tracked assignees.

#8,451
of 50,000 US assignees by volume: Top 26%
by Innovation Score (44.4/100): 8.1
avg claims per patent: -27%
filing velocity, last 5 yrs

Portfolio overview

National Chain Company has been granted 38 US utility patents between 2015 and 2025, placing National Chain Company at rank #8,451 across all assignees tracked by PlainPatent. This portfolio spans 12 distinct Cooperative Patent Classification (CPC) subclasses, averaging 8.1 claims per patent with primary concentration in A44C (PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS). As a US Corporation, National Chain Company is one of the more focused assignees in the PatentsView dataset. By volume, National sits between Nalux Co., Ltd. (38 patents, rank #8,447) and OTOS WING Co., Ltd. (38 patents, rank #8,455) - the closest US assignees by grant volume. The composite Innovation Score of 44.4/100 blends portfolio volume, filing velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Filing cadence tells the strategic story. Between 2020 and 2025 the company received 16 grants, compared with 22 in the 2015–2019 window, a -27% shift in five-year velocity. A cooling filing rate may reflect portfolio consolidation, shifting priorities, or reduced R&D throughput. The US Corporation classification further shapes interpretation, since corporate, government, and individual filers pursue patents for materially different reasons.

Claim depth and technology breadth together indicate competitive posture. National Chain Company's 8.1 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while concentration in 12 subclasses points to a focused technical program. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark National Chain Company against peers pursuing similar technology classes.

Nalux

38
National Center O…

38
Nidec Copal

38
Nippon Chemiphar

38
National Steel Car

38
Novimmune

38
Ormat

38
OTOS WING

38
National Chain ◀

38

What this shows National holds 38 patents at rank #8,451, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near National

By rank, the assignees closest to #8,451 in granted patent volume.

Leaders in A44C (Personal Adornments)

Other assignees with the most granted patents in National's primary technology class.

National's Innovation Score vs. every tracked assignee

Composite of portfolio volume, filing velocity, technology breadth, and claim depth (0–100)

44 Top 26% higher than 74% of 50,000 US assignees

Each bar is a band; taller bars hold more US assignees. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source USPTO PatentsView, PlainPatent Innovation Score · 2015–2025

USPTO utility patent grants by year · 2015–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2015–2019 baseline. Full figures in the table below.

View data table

National Chain Company patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	1	2.6%
2016	3	7.9%
2017	6	15.8%
2018	10	26.3%
2019	2	5.3%
2020	3	7.9%
2022	3	7.9%
2024	8	21.1%
2025	2	5.3%

Which technologies does National Chain Company patent most?

A44C - PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS 14

B32B - LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM 3

C22C - ALLOYS 2

C22F - CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS 2

C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING 2

B23K - SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM 2

B65D - CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES 2

B22F - WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER ; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER 1

E21B - EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS 1

F16G - BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR 1

A44D - INDEXING SCHEME RELATING TO BUTTONS, PINS, BUCKLES OR SLIDE FASTENERS, AND TO JEWELLERY, BRACELETS OR OTHER PERSONAL ADORNMENTS 1

B23P - METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 1

Top 12 of 12 technology areas

Patent Moat Analysis

Portfolio Volume Light

Tech Breadth Focused

Claim Depth Simple

Velocity Declining

Where it ranks

Overall rank by patents

#8,451

Across all tracked assignees

Innovation Score

44.4 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

How many patents does National Chain Company hold?

National Chain Company holds 38 US granted patents filed between 2015 and 2025, spanning 12 technology areas.

What is National Chain Company's Innovation Score?

National Chain Company has an Innovation Score of 44.4 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does National Chain Company focus on?

National Chain Company's top technology area is A44C (PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS) with 14 patents. The company has filed patents in 12 CPC subclasses total.

Is National Chain Company's patent filing rate increasing or decreasing?

National Chain Company's recent filing velocity is -27% compared to the prior five-year period. Filing activity has slowed relative to earlier years.

What does claim depth mean for National Chain Company's patents?

National Chain Company's patents average 8.1 claims each. This is relatively simple claim structure, typical for focused inventions.

How is the National Chain Company patent data sourced?

All patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office covering US granted utility patents from 2015 to 2025.

How to use this portfolio

National's 38 grants land it in the top 26% by Innovation Score, but volume alone doesn't tell you where the strength sits.

Read that count against the largest US assignees before treating it as dominance - National ranks #8,451 of 50,000. Top 50 holders
Most of this portfolio concentrates in A44C - see who else leads that technology area. A44C leaders
Check what the four-part Innovation Score actually rewards before comparing it to another company. How the score works

Patent counts and the Innovation Score measure patenting activity, not commercial success or the legal strength of any patent. Many patents are filed defensively. Verify the status of an individual patent against official USPTO records.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the USPTO PatentsView database. Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Data sources used on this page

USPTO PatentsView - the disambiguated bulk patent-grant, assignee, and CPC data this page's figures are derived from. patentsview.org
Cooperative Patent Classification (CPC) - the joint USPTO/EPO classification scheme used to group patents by technology area. cooperativepatentclassification.org
USPTO Patent Public Search - the official interface to verify the status of any individual patent. ppubs.uspto.gov

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.